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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 117 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.49² =
  2. 2.53² =
  3. 3.45² =
  4. 4.62² =
  5. 5.66² =
  6. 6.33² =
  7. 7.83² =
  8. 8.71² =
  9. 9.38² =
  10. 10.91² =
  11. 11.41² =
  12. 12.55² =
  13. 13.52² =
  14. 14.46² =
  15. 15.63² =
  16. 16.81² =
  17. 17.67² =
  18. 18.77² =
  19. 19.86² =
  20. 20.84² =
  21. 21.34² =
  22. 22.97² =
  23. 23.58² =
  24. 24.73² =
  25. 25.98² =
  26. 26.82² =
  27. 27.59² =
  28. 28.96² =
  29. 29.85² =
  30. 30.61² =
  31. 31.92² =
  32. 32.42² =
  33. 33.35² =
  34. 34.64² =
  35. 35.32² =
  36. 36.37² =
  37. 37.65² =
  38. 38.88² =
  39. 39.99² =
  40. 40.54² =

Answer key

  1. 2401
  2. 2809
  3. 2025
  4. 3844
  5. 4356
  6. 1089
  7. 6889
  8. 5041
  9. 1444
  10. 8281
  11. 1681
  12. 3025
  13. 2704
  14. 2116
  15. 3969
  16. 6561
  17. 4489
  18. 5929
  19. 7396
  20. 7056
  21. 1156
  22. 9409
  23. 3364
  24. 5329
  25. 9604
  26. 6724
  27. 3481
  28. 9216
  29. 7225
  30. 3721
  31. 8464
  32. 1764
  33. 1225
  34. 4096
  35. 1024
  36. 1369
  37. 4225
  38. 7744
  39. 9801
  40. 2916

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